In reality, it was her first gang bang because, as it turned out later, she enjoyed it so much.
Another thing happened in reality.
Once, she pulled me very close (only centimeters) to watch her give a stranger a blowjob.
She went out of her way to make it as arousing as possible.
When he came in her mouth, she showed me with her tongue how much she enjoyed his cum, and I thought I had to kiss her.
Instead, she crawled over to him and kissed him, her mouth still full of cum. That typified my wife.
Still, to answer the question (I'm sorry):
On two occasions, she told me afterwards that if her lover had fucked her anally, she probably wouldn't have refused.
I would have found it extremely exciting if she had taken his cock in her hand and put it in her asshole.
It would have been a way of showing me that boundaries don't exist, and that it's her decision and I just have to accept it.